The back loop of the J was done top down. I've yet to see anybody get to the bottom of the front of a J, lift the pen up, and complete the letter in this way. Not just athletes/celebrities mind you, any person in general.

If collectors want to buy a MJ auto, why not just buy a certified auto from UD... there are a few cheap ones out there. just got to search... but these in-person autos... I would stay away, even if the price is right. You never know... they can be fake..